Intensity:
* Loudly
* Softly
* Heartily
* Ringly
* Deeply
* Hysterically
* Uncontrollably
* Fitfully
* Contagiously
* Quietly
* Muffled
Manner:
* Nervously
* Awkwardly
* Sardonicly
* Scoffingly
* Grimly
* Ironically
* Sarcastically
* Mockingly
* Slyly
* Sweetly
Timing:
* Suddenly
* Suddenly
* Unexpectedly
* Continuously
* Repeatedly
Other:
* Warmly
* Joyfully
* Delightedly
* Mischievously
* Wickedly
* Embarrassedly
* Shamefully
This is not an exhaustive list, and you can also combine adverbs for more specific descriptions, such as "loudly and nervously." The best adverbs to use will depend on the context of your writing.